Across
- 5. to stop supplies from entering a country
- 7. a submarine operate underwater
- 9. was an absolute ruler
- 10. the United Stated maintained this until 1917
Down
- 1. to assembly military for active service
- 2. this happened to Archduke Ferdinand in 1914
- 3. a tube shaped bomb that is fired underwater
- 4. to enter into battle
- 6. Tsar Nicholas II did this to his throne on March 15, 1917
- 8. these are made to expland their empires